How can conjunctive adverbs help achieve coherence? They don't illustrate a relationship.
They provide clarity for the meaning of a preceding noun.
They illustrate the connection between two ideas.
They introduce relative clauses.

They illustrate the connection between two ideas.

Explanation:

A conjunctive adverb is used to create a smooth connection between two sentences or independent clauses. The conjunctive adverb shows the logical relationship between one idea and the next and thus helps to provide coherence in a written text.

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the price of our current war is high; it costs money and it costs lives.

but it does not cost our pride. it does not cost the guilt that would arise from knowing that we did nothing to intervene while our neighboring nations fell to despotic leaders.

it does not cost the terror of knowing that our allies are unstable. it does not cost the fear that we, too, will be next to fall.

which sentence most accurately explains why the speaker's use of the parallel structure is effective in this passage?

a. it underscores that disagreement will not be tolerated and will be dealt with swiftly.

b. it makes the speaker seem like a decisive and capable leader.

c. it emphasizes reasons to fight and inspires listeners to aid the war effort.

d. it establishes the speaker's credibility by acknowledging the difficulties of war.